Latest weather at Gatwick:

at 12:50 today: variable wind direction at 2 knots, 3 Km vis in haze, ceiling of cloud at 400 feet AGL. Temp is 0 C with a dew point of minus 1 C. Pressure is also 1029 hPa.

METAR EGKK 051250Z VRB02KT 3000 HZ BKN004 00/M01 Q1029

Forecast:

TAF EGKK 051101Z 0512/0618 12005KT 4000 BR BKN007
TEMPO 0512/0519 6000 NSW SCT005
PROB40 TEMPO 0518/0612 0200 -DZ FG VV///
BECMG 0609/0612 2000 BR BKN004
TEMPO 0611/0618 6000 SCT005 BKN015

issued at 11:00 today covering from 12 noon today until 18:00 tomorrow.

conditions at start of forecast were 4 Km vis in mist, ceiling of cloud at 700 ft AGL.

they expect a temporary period between 12:00 and 19:00 of good conditions with 6 Km vis and no significant weather with some scattered cloud at 500 ft AGL.

There is a 40 percent probability of some temporary drastic reductions between 18:00 today and 12 noon tomorrow, that conditions could go down to 200 m vis in light drizzle and fog in fogged in conditions.

Later on it will become better again between 09:00 and 12:00 with 2 Km vis in mist and low cloud ceiling of 400 feet AGL.

Temporarily between 11:00 and 18:00 tomorrow, they expect some breaks in the weather with vis increasing up to 6 Km and the cloud to also break up a bit with some scattered cloud at 600 ft AGL and a ceiling at 1500 ft AGL.

So similar to LHR in that they expect the moisture remaining on the ground to be a problem and cause reduced visibility and fog this evening after the Sun goes down until tomorrow morning when the Sun comes back and starts to stir things up...thereafter (9 AM) things improve and no interruptions to flights from weather..again, if the forecast is correct.